v0.2.52..v0.2.53 changeset JniConversion.h

diff --git a/hoot-josm/src/main/cpp/hoot/core/jni/JniConversion.h b/hoot-josm/src/main/cpp/hoot/core/jni/JniConversion.h
new file mode 100644
index 0000000..101d6da
--- /dev/null
+++ b/hoot-josm/src/main/cpp/hoot/core/jni/JniConversion.h
@@ -0,0 +1,121 @@
+/*
+ * This file is part of Hootenanny.
+ *
+ * Hootenanny is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --------------------------------------------------------------------
+ *
+ * The following copyright notices are generated automatically. If you
+ * have a new notice to add, please use the format:
+ * " * @copyright Copyright ..."
+ * This will properly maintain the copyright information. DigitalGlobe
+ * copyrights will be updated automatically.
+ *
+ * @copyright Copyright (C) 2019, 2020 DigitalGlobe (http://www.digitalglobe.com/)
+ */
+#ifndef JNI_CONVERSION_H
+#define JNI_CONVERSION_H
+
+// JNI
+#include <jni.h>
+
+// Qt
+#include <QString>
+#include <QMap>
+#include <QSet>
+
+namespace hoot
+{
+
+/**
+ * Common conversion utilities to go between Java and C++ using JNI.
+ *
+ * Helpful JNI references:
+ *
+ * https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/functions.html
+ * http://journals.ecs.soton.ac.uk/java/tutorial/native1.1/implementing/method.html
+ */
+class JniConversion
+{
+
+public:
+
+  /**
+   * Converts a Qt string to a Java string
+   *
+   * @param javaEnv the associated JNI environment
+   * @param cppStr the string to convert
+   * @return a Java string
+   */
+  static jstring toJavaString(JNIEnv* javaEnv, const QString& cppStr);
+
+  /**
+   * Converts a Java string to a Qt string
+   *
+   * @param javaEnv the associated JNI environment
+   * @param javaStr the string to convert
+   * @return a Qt string
+   */
+  static QString fromJavaString(JNIEnv* javaEnv, jstring javaStr);
+
+  /**
+   * Converts a Qt string list to a Java string list
+   *
+   * @param javaEnv the associated JNI environment
+   * @param cppStrList the list to convert
+   * @return a Java string list
+   */
+  static jobject toJavaStringList(JNIEnv* javaEnv, const QStringList& cppStrList);
+
+  /**
+   * Converts a Java string list to a Qt string list
+   *
+   * @param javaEnv the associated JNI environment
+   * @param javaStrList the list to convert
+   * @return a Qt string list
+   */
+  static QStringList fromJavaStringList(JNIEnv* javaEnv, jobject javaStrList);
+
+  /**
+   * Converts a Java string set to a Qt string set
+   *
+   * @param javaEnv the associated JNI environment
+   * @param javaStrSet the set to convert
+   * @return a Qt string set
+   */
+  static QSet<QString> fromJavaStringSet(JNIEnv* javaEnv, jobject javaStrSet);
+
+  /**
+   * Converts a Java map with strings as keys and values to a Qt map with strings as keys and values
+   *
+   * @param javaEnv the associated JNI environment
+   * @param javaMap the map to convert
+   * @return a Qt map
+   */
+  static QMap<QString, QString> fromJavaStringMap(JNIEnv* javaEnv, jobject javaMap);
+
+  /**
+   * Converts a Java map with strings as keys and integers as values to a Qt map with strings as
+   * keys and integers as values
+   *
+   * @param javaEnv the associated JNI environment
+   * @param javaMap the map to convert
+   * @return a Qt map
+   */
+  static QMap<QString, int> fromJavaStringIntMap(JNIEnv* javaEnv, jobject javaMap);
+};
+
+}
+
+#endif // JNI_CONVERSION_H